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app: add gimp_layer_mode_is_trivial() 

Add a TRIVIAL layer-mode flag, and corresponding
gimp_layer_mode_is_trivial() function, which indicates if the blend
function of a given layer mode is trivial, i.e., either never
modifies the source pixels (for non-subtractive modes), or always
clears the destination pixels (for subtractive modes).
This commit is contained in:
Ell 2018-12-02 02:55:05 -05:00
parent 2e3eab7fbd
commit 8adec5fb3a
3 changed files with 27 additions and 8 deletions
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31
app/operations/layer-modes/gimp-layer-modes.c
View File

@ -60,7 +60,8 @@ static const GimpLayerModeInfo layer_mode_infos[] =
.flags = GIMP_LAYER_MODE_FLAG_LEGACY |
GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE |
GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE |
GIMP_LAYER_MODE_FLAG_TRIVIAL,
.context = GIMP_LAYER_MODE_CONTEXT_ALL,
.paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
.composite_mode = GIMP_LAYER_COMPOSITE_UNION,
@ -70,8 +71,9 @@ static const GimpLayerModeInfo layer_mode_infos[] =
{ GIMP_LAYER_MODE_DISSOLVE,
.op_name = "gimp:dissolve",
.flags = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE |
GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE,
.flags = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE |
GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
GIMP_LAYER_MODE_FLAG_TRIVIAL,
.context = GIMP_LAYER_MODE_CONTEXT_ALL,
.paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
.composite_mode = GIMP_LAYER_COMPOSITE_UNION
@ -436,7 +438,8 @@ static const GimpLayerModeInfo layer_mode_infos[] =
{ GIMP_LAYER_MODE_NORMAL,
.op_name = "gimp:normal",
.flags = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE,
.flags = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE |
GIMP_LAYER_MODE_FLAG_TRIVIAL,
.context = GIMP_LAYER_MODE_CONTEXT_ALL,
.paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
.composite_mode = GIMP_LAYER_COMPOSITE_UNION,
@ -775,7 +778,8 @@ static const GimpLayerModeInfo layer_mode_infos[] =
.op_name = "gimp:erase",
.flags = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE |
GIMP_LAYER_MODE_FLAG_SUBTRACTIVE |
GIMP_LAYER_MODE_FLAG_ALPHA_ONLY,
GIMP_LAYER_MODE_FLAG_ALPHA_ONLY |
GIMP_LAYER_MODE_FLAG_TRIVIAL,
.context = GIMP_LAYER_MODE_CONTEXT_ALL,
.paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
.composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
@ -785,7 +789,8 @@ static const GimpLayerModeInfo layer_mode_infos[] =
{ GIMP_LAYER_MODE_MERGE,
.op_name = "gimp:merge",
.flags = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE,
.flags = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE |
GIMP_LAYER_MODE_FLAG_TRIVIAL,
.context = GIMP_LAYER_MODE_CONTEXT_ALL,
.paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
.composite_mode = GIMP_LAYER_COMPOSITE_UNION,
@ -798,7 +803,8 @@ static const GimpLayerModeInfo layer_mode_infos[] =
.flags = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE |
GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
GIMP_LAYER_MODE_FLAG_SUBTRACTIVE |
GIMP_LAYER_MODE_FLAG_ALPHA_ONLY,
GIMP_LAYER_MODE_FLAG_ALPHA_ONLY |
GIMP_LAYER_MODE_FLAG_TRIVIAL,
.context = GIMP_LAYER_MODE_CONTEXT_ALL,
.paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
.composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP
@ -1189,6 +1195,17 @@ gimp_layer_mode_is_alpha_only (GimpLayerMode mode)
return (info->flags & GIMP_LAYER_MODE_FLAG_ALPHA_ONLY) != 0;
}
gboolean
gimp_layer_mode_is_trivial (GimpLayerMode mode)
{
const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
if (! info)
return FALSE;
return (info->flags & GIMP_LAYER_MODE_FLAG_TRIVIAL) != 0;
}
GimpLayerColorSpace
gimp_layer_mode_get_blend_space (GimpLayerMode mode)
{

1
app/operations/layer-modes/gimp-layer-modes.h
View File

@ -33,6 +33,7 @@ gboolean gimp_layer_mode_is_composite_mode_mutable (GimpLayer
gboolean gimp_layer_mode_is_subtractive (GimpLayerMode mode);
gboolean gimp_layer_mode_is_alpha_only (GimpLayerMode mode);
gboolean gimp_layer_mode_is_trivial (GimpLayerMode mode);
GimpLayerColorSpace gimp_layer_mode_get_blend_space (GimpLayerMode mode);
GimpLayerColorSpace gimp_layer_mode_get_composite_space (GimpLayerMode mode);

3
app/operations/operations-enums.h
View File

@ -182,7 +182,8 @@ typedef enum /*< pdb-skip, skip >*/
GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE = 1 << 2,
GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE = 1 << 3,
GIMP_LAYER_MODE_FLAG_SUBTRACTIVE = 1 << 4,
GIMP_LAYER_MODE_FLAG_ALPHA_ONLY = 1 << 5
GIMP_LAYER_MODE_FLAG_ALPHA_ONLY = 1 << 5,
GIMP_LAYER_MODE_FLAG_TRIVIAL = 1 << 6
} GimpLayerModeFlags;